Rotary pump



H. T. WOO

ROTARY PUMP Nov. 14, 1933..

Filed Oct. 2, 1929 5 Sheets-Sheet 1 INVENTOR flag/e 7' W00 ATTORNEY NOV. 14, 1933. woo 1,935,198

ROTARY PUMP Filed Oct. 2, 1929 3 Sheets-Sheet 2 i xy; Z

r INVENTOR Ham 7. 14/00 ATTORNEY Nov. 14, 1933. H. T. woo 1,935,198

ROTARY PUMP Filed Oct. 2, 1929 5 Sheets-Sheet 3 INVENTOR fig/May 77 Mo ATTORNEY Patented Nov. 14, 1933 Q UNITED 5;

PATENT OFFICE. f

ROTARY PUMP Hanley T. Woo, Seattle, Wash. 7 Application October 2, 1929'. Serial No. 396,813

' 1 Claim; (01. 103-140) My invention'relates to rotary pumps andthe objectof myinvention is to provide a rotary pump'which, is self-priming, highly eflicient in operation, whichghas a very large capacity in proportion .to the size of the machine, which is simple and cheap in construction,.which has few moving parts and will run without vibration, which has means for automatically compensating for wear on the vanes and whichwill not be seriously affected. by grit, sand and dirt in the liquid. I 1

Another object is to provide a pump. of this nature having a cylindrical rotor eccentrically disposed within. a cylindrical housing of larger size, said rotor having vanes pivotally mounted therein and arranged to follow the walls of the housing as the rotor rotates, thevanes also having resilient means for urging them outwardly and having rollers thereon for rolling on the-- walls of the cylindrical housing to reduce friction and wear between the vanes and the housmg' V 'Anotherobject is to provide means, in the nature of passageways in the rotors, for allowing theliquid pressure on the discharge side of the pump to enter, behind the vanes on'the suction side and help to hold said vanes outagainst the walltof the housing. during the time. they are moving outwardly.

Other andv more specific objects will be apparent from the following description taken in connection with the accompanying drawings.

.Rotary pumps are usuallyprovided with vanes which Wear against the internal wall of a hous ing in which 'they'are enclosed. When these pumps are used for pumping water containing. sand and 'grit they wear and out very rapidly.-

This soon causes leakage past the vanes which greatly reduces the efiiciency of said pumps and finally renders the pumps totally inoperative. In accordance with my invention I provide rollers on the vanes arranged to roll on the inner walls invention, throughout which drawingslike reference numerals indicate like parts: Figure 1 is an elevation, with a side wall of the housing removed, of a rotary pump constructed in accordance with my invention;

Fig. 2 is a vertical cross section of the same substantially on .a broken line 22 of Fig. 3;.

Fig. 3 is a vertical cross section substantially on. a broken line 33 of Fig. 2; p Fig. 4 is adetached elevation of one of the vanes with one roller removed and the other roller on the vane; and i Fig. 5 is an elevation of the vane shown in i Fig. 4.

Referring to the drawings, 6 designates a main housing member provided with a cylindrical inner' wall 7' and having oppositely disposed intake and discharge ports 8 and 9 respectively. The housing member 6 is provided with a base .10 and has two end plates 11 and 12 secured thereto by cap screws 13. A bearing 14 having a closed end-may be provided on the end plate '11 and a stufling box 15 may be provided in .the other end plate 12.1or preventing leakage around amain shaft 16. A separate bearing bracket 17 isse-- cured to the end plate 12 and extends outwardly beyond the stufiing box 15 to form a bearing for' this end of the shaft 16. A drain cock18 may be provided in one of the side plates, as in the plate 11, near the bottom of the pump.

The shaft 16 is eccentric relative to the housing 6 andcarries a rotor which is eccentrically dis posed within said housing. The rotor comprises" opposite notches 22 and. 23 for the reception or vanes 24 and 25 respectively. The shaft 16 is concentric relative to the rotor and eccentric relative to the housing so that the rotor is held in contact with the housing wall at a point be-' tween the intake 8 and discharge 9 and leaves a crescent shaped passageway extending'from one side of this contact point or area around the major portion of the rotor and housing to :the other side of said Contact point orarea. Side plates 26 and 27 are rigidly secured to the sides of the rotor, as by screws 28. These side plates havediametrically opposite recesses 29 and 30 positioned over the rotor notches 23 and 22 and adapted to receive rollers 31, as shown in Fig. 1. The rollers 31 are mounted on bearing pins 32 which extend rotatably through the vanes 24 and 25 so that said rollers are allowed to move inwardly and outwardly within the recesses 29 and 30 as the vanes move within the notches 22 and 23. The rollers 31 are positioned so that they roll on the cylindrical walls '7 of the housing and relieve the vanes of frictional contact and wear as the rotor rotates.

The rear ends of the vanes 24 and 25 are seated within the rear ends of the notches 22 and 23 and are mounted on pivot pins 33 which extend outwardly through the side plates 26 and 27. The front ends of the vanes are curved arcuately from centers of curvature located at the centers of the pivot pins 33 and the front walls 34 of the notches 22 and 23 are similarly curved to allow the vanes to move inwardly and outwardly without drawing away from said walls. The outer surfaces of the vanes are curved from the rear to a point near the forward end, preferably on the same radius as the rotor, and have their front ends curved 011 more sharply as at 34' to fit the wall 7 when the vanes are in the outermost position in which the lower vane 25 is shown in Fig. 1. The vanes are preferably cored out on their inner sides as shown in Fig. 2, thereby affording a storage space for liquid, and are suitably shaped to conform to the curvature of the bottoms of the'notches 22 and23. Two slidably mountedpins 35 and 36 extend diametrical- ;:ly through the rotor hub 20 and shaft '16 and press outwardly against the vanes 24 and 25 to assist inholding said vanes in contact with the walls 7 of the housing. A compression spring 3'7 is in'-.

terposed between the twopins 35*and'36. The 5;:vanes 24 and. 25 are also urged outwardly by centrifugal force due to the rotation of the rotor. Said vanes are further urged outwardly by fluid pressure as follows: The rotor 19 is cored out betweenthe vanes leaving cavities 38 .and these 35 jcavities 38 are connected with the notches 22 and 23 by passageways 39, see Fig. 2. When the vanes are in the position shown in Fig. 1 most of the liquid under the uppermost vane .24 will I be squeezed out and will fillthe notch 23 under 40;; -the vane 25. As the rotor moves on around'in a. counter clockwise direction toward the position shown in Fig. 2 the vane 25 will be moved inwardly, squeezing out the liquid from the notch 23 and, forcing it into the notch 22 back of the :.gvane 24 thus tending to force the vane 24 outwardly. This relieves excess pressure back of the inwardly moving vaneand creates a desired pressure. back of the outwardly moving vane. This pressure is :also communicated to the recesses 29 and 30 back of the rollers 31.

The wall of the housing 6 at the lower edge of the inlet port 8 is cut away as at 40 to avoid constriction at this point and afford a larger intake opening- In the operation of this pump when the rotor is drivenin a counter clockwise direction as indicated by the arrows in Figs. 1 and .2 water will be the same and there are no abrupt changes in the direction of flow of the water. This is conducive to high efficiency and. to the elimination of vibration in the pump.

The recesses 38 retain the liquid so that upon restarting the pump after remaining idle the pump embodying my invention has self-contained water ready to effect a seal and thereby eliminate all necessity of priming, a most important even necessary feature when a pump of this type is employed in pumping lubricating oil for an internal combustion motor or fuel oil for an oil burner apparatus.

The bottom of the inlet port and the bottom of the outlet port must be in applicants device at least 180 degrees apart where he employs two vanes spaced 180 degrees apart. This avoids loss -of efiiciency by the complete separation at all times between the high pressure outlet and the 'low pressure inlet.

The rollers 31 rolling on the wall '7 of the housing support the vanes against radial thrust and prevent. excessivev wear and friction between the vanes and the housing wall and tend'to prevent rapid wear where water containing sand and grit is being pumped.

Obviously, changes may be made in the form, dimensions and arrangement of the parts of'my invention, without departing'from the principle thereof, the above setting forth only a preferred form of embodiment.

I claim: i.

A rotary pump embodying acylindrical housing; a rotor eccentrically mounted for rotation within said housing; means forming an intake port and a discharge port, said ports being disposed substantially at'or above the horizontal plane through the center of the rotor, said rotor being tangential to the walls of said housing,-

substantially midway between said ports, said intake port having a'cutaway portion at its lower edge extending downwardly therefrom, communicating with. the interiorof said housing, and affording an enlarged intake opening, said rotor having two diametrically opposite notches in its periphery; two pumping vanes operatively mounted in said notches, said pumping vanes having internal cavities for storage space in communication with said notches; two relatively large cored cavities in sectors of the body of the rotor,

said cavities, extending substantially allof the distance between the respective notches and substantially from thecenter to thecircumference of therotor; relatively restricted passageways positioned substantially adjacent the central wall of the'cavities and establishing communication through said relatively restricted passageways between each cavity and each notch, whereby a substantial storage space for fluid is provided within the rotor and the vanes, so that a substantial supply of fluid for priming purposes upon restarting the pump is available.

HANLEY T. WOO. 

